This patch adds support for the regulator framework to the tsl2772
driver. Driver was tested using a LG Nexus 5 (hammerhead) phone with
the two regulators and on a Raspberry Pi 2 without any regulators
controlling the power to the sensor.
Signed-off-by: Brian Masney <masneyb@xxxxxxxxxxxxx>
---
drivers/iio/light/tsl2772.c | 95 ++++++++++++++++++++++++++++++++++++-
1 file changed, 94 insertions(+), 1 deletion(-)
diff --git a/drivers/iio/light/tsl2772.c b/drivers/iio/light/tsl2772.c
index ae00edf0d87e..4a11bf77a4d0 100644
--- a/drivers/iio/light/tsl2772.c
+++ b/drivers/iio/light/tsl2772.c
@@ -20,6 +20,7 @@
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/platform_data/tsl2772.h>
+#include <linux/regulator/consumer.h>
/* Cal defs */
#define PROX_STAT_CAL 0
@@ -109,6 +110,9 @@
#define TSL2772_MAX_PROX_LEDS 2
+#define TSL2772_BOOT_MIN_SLEEP_TIME 10000
+#define TSL2772_BOOT_MAX_SLEEP_TIME 28000
+
/* Device family members */
enum {
tsl2571,
@@ -156,6 +160,8 @@ struct tsl2772_chip {
struct mutex prox_mutex;
struct mutex als_mutex;
struct i2c_client *client;
+ struct regulator *vdd_supply;
+ struct regulator *vddio_supply;
u16 prox_data;
struct tsl2772_als_info als_cur_info;
struct tsl2772_settings settings;
@@ -676,6 +682,52 @@ static int tsl2772_als_calibrate(struct iio_dev *indio_dev)
return ret;
}
+static void tsl2772_disable_regulators_action(void *_data)
+{
+ struct tsl2772_chip *chip = _data;
+
+ regulator_disable(chip->vdd_supply);
+ regulator_disable(chip->vddio_supply);
+}
+
+static int tsl2772_enable_regulator(struct tsl2772_chip *chip,
+ struct regulator *regulator)
+{
+ int ret;
+
+ ret = regulator_enable(regulator);
+ if (ret < 0) {
+ dev_err(&chip->client->dev, "Failed to enable regulator: %d\n",
+ ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static struct regulator *tsl2772_get_regulator(struct tsl2772_chip *chip,
+ char *name)
+{
+ struct regulator *regulator;
+ int ret;
+
+ regulator = devm_regulator_get(&chip->client->dev, name);
+ if (IS_ERR(regulator)) {
+ if (PTR_ERR(regulator) != -EPROBE_DEFER)
+ dev_err(&chip->client->dev,
+ "Failed to get %s regulator %d\n",
+ name, (int)PTR_ERR(regulator));
+
+ return regulator;
+ }
+
+ ret = tsl2772_enable_regulator(chip, regulator);
+ if (ret < 0)
+ return ERR_PTR(ret);
+
+ return regulator;
+}
+
static int tsl2772_chip_on(struct iio_dev *indio_dev)
{
struct tsl2772_chip *chip = iio_priv(indio_dev);
@@ -1733,6 +1785,27 @@ static int tsl2772_probe(struct i2c_client *clientp,
chip->client = clientp;
i2c_set_clientdata(clientp, indio_dev);
+ chip->vddio_supply = tsl2772_get_regulator(chip, "vddio");
+ if (IS_ERR(chip->vddio_supply))
+ return PTR_ERR(chip->vddio_supply);
+
+ chip->vdd_supply = tsl2772_get_regulator(chip, "vdd");
+ if (IS_ERR(chip->vdd_supply)) {
+ regulator_disable(chip->vddio_supply);
+ return PTR_ERR(chip->vdd_supply);
+ }
+
+ ret = devm_add_action(&clientp->dev, tsl2772_disable_regulators_action,
+ chip);
+ if (ret < 0) {
+ tsl2772_disable_regulators_action(chip);
+ dev_err(&clientp->dev, "Failed to setup regulator cleanup action %d\n",
+ ret);
+ return ret;
+ }
+
+ usleep_range(TSL2772_BOOT_MIN_SLEEP_TIME, TSL2772_BOOT_MAX_SLEEP_TIME);
+
ret = i2c_smbus_read_byte_data(chip->client,
TSL2772_CMD_REG | TSL2772_CHIPID);
if (ret < 0)
@@ -1806,13 +1879,33 @@ static int tsl2772_probe(struct i2c_client *clientp,
static int tsl2772_suspend(struct device *dev)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct tsl2772_chip *chip = iio_priv(indio_dev);
+ int ret;
- return tsl2772_chip_off(indio_dev);
+ ret = tsl2772_chip_off(indio_dev);
+ regulator_disable(chip->vdd_supply);
+ regulator_disable(chip->vddio_supply);
+
+ return ret;
}
static int tsl2772_resume(struct device *dev)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct tsl2772_chip *chip = iio_priv(indio_dev);
+ int ret;
+
+ ret = tsl2772_enable_regulator(chip, chip->vddio_supply);
+ if (ret < 0)
+ return ret;
+
+ ret = tsl2772_enable_regulator(chip, chip->vdd_supply);
+ if (ret < 0) {
+ regulator_disable(chip->vddio_supply);
+ return ret;
+ }
+
+ usleep_range(TSL2772_BOOT_MIN_SLEEP_TIME, TSL2772_BOOT_MAX_SLEEP_TIME);
return tsl2772_chip_on(indio_dev);
}
--
2.17.1
--
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